<template>
  <div>
		<!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

		<!-- 卡片区 -->
		<el-card>
			<el-alert	title="添加商品信息"	type="info"	center	show-icon :closable="false" ></el-alert>

			<!-- 步骤条 -->
			<el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
				<el-step title="基本信息"></el-step>
				<el-step title="商品参数"></el-step>
				<el-step title="商品属性"></el-step>
				<el-step title="商品图片"></el-step>
				<el-step title="商品内容"></el-step>
				<el-step title="完成"></el-step>
			</el-steps>

			<!-- 左侧Tab栏 -->
			<el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-tabs @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex"  tab-position="left">
					<el-tab-pane label="基本信息" name="0">
						<el-form-item label="商品名称" prop="goods_name">
							<el-input v-model="addForm.goods_name"></el-input>
						</el-form-item>
						<el-form-item label="商品价格" prop="goods_price">
							<el-input v-model="addForm.goods_price" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品重量" prop="goods_weight">
							<el-input v-model="addForm.goods_weight" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品数量" prop="goods_number">
							<el-input v-model="addForm.goods_number" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品分类" prop="goods_cat">
							<el-cascader
								v-model="addForm.goods_cat"
								:options="catelist"
								:props="cateProps"
								@change="handleChange"></el-cascader>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品参数" name="1">
						<el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in manyTableData">
							<el-checkbox-group v-model="item.attr_vals">
								<el-checkbox border :label="cb" :key="i" v-for="(cb, i) in item.attr_vals"></el-checkbox>
							</el-checkbox-group>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品属性" name="2">
						<el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in onlyTableData">
							<el-input v-model="item.attr_vals"></el-input>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品图片" name="3">
						<el-upload
							:headers="headerObj"
							:action="uploadURL"
							:on-preview="handlePreview"
							:on-remove="handleRemove"
							:on-success="handleSuccess"
							list-type="picture">
							<el-button size="small" type="primary">点击上传</el-button>
							<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
						</el-upload>
					</el-tab-pane>
					<el-tab-pane label="商品内容" name="4">
						<!-- 富文本编辑器组件 -->
						<quill-editor v-model="addForm.goods_introduce"></quill-editor>
						<el-button type="primary" class="btn_add" @click="add">添加商品</el-button>
					</el-tab-pane>
				</el-tabs>
			</el-form>
		</el-card>
		<!-- 展示图片的对话框 -->
		<el-dialog
		title="图片预览"
		:visible.sync="previewVisible"
		width="50%">
		<img class="preview_img" :src="previewPath" alt="">
		</el-dialog>
	</div>
</template>

<script>
import _ from 'lodash'
export default {
	data() {
		return {
			activeIndex: '0',
			addForm: {
				goods_name: '',
				goods_price: 0,
				goods_weight: 0,
				goods_number: 0,
				goods_cat: [],
				pics: [],
				goods_introduce: '',
				attrs: []
			},
			catelist: [],
			cateProps: {
				expandTrigger: 'hover',
				label: 'cat_name',
				value: 'cat_id',
				children:'children'
			},
			manyTableData: [],
			onlyTableData: [],
			previewPath: '',
			previewVisible: false,
			headerObj: {
				Authorization: window.sessionStorage.getItem('token')
			},
			uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
			addFormRules: {
				goods_name: [
					{ required: true, message: '请输入商品名称', trigger: 'blur'}
				],
				goods_price: [
					{ required: true, message: '请输入商品价格', trigger: 'blur'}
				],
				goods_weight: [
					{ required: true, message: '请输入商品重量', trigger: 'blur'}
				],
				goods_number: [
					{ required: true, message: '请输入商品数量', trigger: 'blur'}
				],
				goods_cat: [
					{ required: true, message: '请选择商品分类', trigger: 'blur'}
				]
			}
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		async getCateList() {
			const {data: res} = await this.$http.get('categories')
			if(res.meta.status !== 200) {
				return this.$message.error('获取分类数据失败')
			}
			this.$message.success('获取分类数据成功')
			this.catelist = res.data
			// console.log(this.catelist);
		},
		handleChange() {
			if(this.addForm.goods_cat.length !== 3) {
				this.addForm.goods_cat = []
			}
		},
		beforeTabLeave(activeName, oldActiveName) {
			if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
				this.$message.error('请先选择商品分类')
				return false
			}
		},
		async tabClicked() {
			// console.log(this.activeIndex);
			if(this.activeIndex === '1') {
				// 证明访问的是动态参数面板
				const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
				if(res.meta.status !== 200) {
					return this.$message.error('获取动态参数列表失败')
				}
				// console.log(res.data);
				res.data.forEach(item =>{
					item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
				})
				this.manyTableData = res.data
			} else if(this.activeIndex === '2') {
				// 证明访问的是静态属性的面板
				const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
				if(res.meta.status !== 200) {
					return this.$message.error('获取静态参数列表失败')
				}
				this.onlyTableData = res.data
			}
		},
		// 处理图片预览效果
		handlePreview(file) {
			this.previewPath = file.response.data.url
			this.previewVisible = true
		},
		// 处理移出图片的操作
		handleRemove(file) {
			const filePath = file.response.data.tmp_path
			const i = this.addForm.pics.findIndex(x => {
				x.pic === filePath
			})
			this.addForm.pics.splice(i, 1)
		},
		// 监听图片上传成功的事件
		handleSuccess(response) {
			const picInfo = {pic: response.data.tmp_path}
			this.addForm.pics.push(picInfo)
		},
		add() {
			this.$refs.addFormRef.validate(async valid => {
				if(!valid) {
					return this.$message.error('请添加必要的表单项')
				}
				const form = _.cloneDeep(this.addForm)
				form.goods_cat = form.goods_cat.join(',')
				this.manyTableData.forEach(item=>{
					const newInfo = {
						attr_id: item.attr_id, 
						attr_value: item.attr_vals.join(',')
					}
					this.addForm.attrs.push(newInfo)
				})
				this.onlyTableData.forEach(item=>{
					const newInfo = {
						attr_id: item.attr_id, 
						attr_value: item.attr_vals
					}
					this.addForm.attrs.push(newInfo)
				})
				form.attrs = this.addForm.attrs
				const {data: res} = await this.$http.post('goods', form)
				if(res.meta.status !== 201) {
					return this.$message.error('添加商品失败')
				}
				this.$message.success('添加商品成功')
				this.$router.push('/goods')
			})
		}
	},
	// 计算属性
	computed: {
		cateId() {
			if(this.addForm.goods_cat.length === 3) {
				return this.addForm.goods_cat[2]
			}
			return null
		}
	}
}
</script>

<style lang="less" scoped>
.el-checkbox {
	margin: 0 10px 0 0!important;
}
.preview_img {
	width: 100%;
}
.btn_add {
	margin-top: 15px;
}
</style>